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For B-frames if the second reference frame signals intensity compensation

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then the first reference frame should be intensity compensated.

Originally committed as revision 6308 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-09-21 04:44:35 +00:00
parent 162f412dec
commit 6b33eed83f
1 changed files with 12 additions and 0 deletions
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12
libavcodec/vc1.c
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@ -332,6 +332,7 @@ typedef struct VC1Context{
int dmb_is_raw; ///< direct mb plane is raw
int skip_is_raw; ///< skip mb plane is not coded
uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
int use_ic; ///< use intensity compensation in B-frames
int rnd; ///< rounding control
/** Frame decoding info for S/M profiles only */
@ -1427,6 +1428,8 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
//av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",
// (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);
if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;
switch(v->s.pict_type) {
case P_TYPE:
if (v->pq < 5) v->tt_index = 0;
@ -1441,6 +1444,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
v->use_ic = 1;
/* fill lookup tables for intensity compensation */
if(!v->lumscale) {
scale = -64;
@ -2106,18 +2110,26 @@ static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direc
{
int t;
if(v->use_ic) {
v->mv_mode2 = v->mv_mode;
v->mv_mode = MV_PMODE_INTENSITY_COMP;
}
if(direct) {
vc1_mc_1mv(v, 0);
vc1_interp_mc(v);
if(v->use_ic) v->mv_mode = v->mv_mode2;
return;
}
if(mode == BMV_TYPE_INTERPOLATED) {
vc1_mc_1mv(v, 0);
vc1_interp_mc(v);
if(v->use_ic) v->mv_mode = v->mv_mode2;
return;
}
if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;
vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
if(v->use_ic) v->mv_mode = v->mv_mode2;
}
static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)